French victory at Grand Port and British conquest of Isle de France

Background. The Mauritius campaign of 1809–1811 was a minor military campaign of the Napoleonic Wars fought between British and French forces over France's Indian Ocean colonies. The campaign saw substantial frigate squadrons deployed to protect or disrupt British-flagged shipping. The Battle of Grand Port was fought between the British and French navies over the harbour of Grand Port, then in Isle de France, as part of this campaign.

Naval Engagement. The Battle of Grand Port was fought on 20–27 August 1810. It is notable for the local superiority enjoyed by the French Navy in autumn 1810 following their victory, which was the British navy's most significant defeat in the campaign. The French had previously disrupted British trade, capturing East Indiamen, but were forced to remain in harbour as British forces were reinforced.

Invasion and Surrender. The invasion of Isle de France was a complicated but successful British amphibious operation launched in November 1810. Although prompted by the defeat at Grand Port, the invasion had been the ultimate intention of Rowley's squadron since 1809. British forces assembled off Grand Baie in late November, leading to the occupation of the island and its renaming as Mauritius.